Thanks
I'm getting quite annoyed now. I decided to have a closer look at my MacBook, all over.

I've found this little cracks all over the case, in random places.
Under the Ethernet port, on the circle used to take the battery out, on the indent on the front of the laptop, used to open the lid, at the back of the laptop.
The casing around the screen feels like it's coming off, if I tap it, near where it says MacBook, it makes a sound, and there's a gap where you can tell it's coming off.